/**
 * #      315
 * 名称   计算右侧小于当前元素的个数
 * 链接   https://leetcode-cn.com/problems/count-of-smaller-numbers-after-self
 * 题解   [423](https://leetcode-cn.com/problems/count-of-smaller-numbers-after-self/solution)
 * 通过率 42.1%
 * 难道   困难
 */

